Medium severity · published Jul 10, 2026
CVE-2026-55669
ZITADEL: Missing Token Audience Validation (`aud`) in JWT IdP Provider
4.2
CVSS
0.2%
EPSS
No
On KEV
Description
ZITADEL is an open source identity management platform. Prior to 3.4.12 and 4.15.2, ZITADEL's external JWT Identity Provider validates a token's signature and issuer (iss) but not the audience (aud) claim, allowing a validly signed token from a trusted issuer for another relying party to be accepted by ZITADEL. This issue is fixed in versions 3.4.12 and 4.15.2.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZI
zitadel · zitadel
>= 4.0.0-rc.1, < 4.15.2; < 3.4.12 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-55669
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-55669
github.com
https://github.com/zitadel/zitadel/releases/tag/v3.4.12
github.com
https://github.com/zitadel/zitadel/releases/tag/v4.15.2
github.com
https://github.com/zitadel/zitadel/security/advisories/GHSA-g5h5-m4hm-xjrr
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